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Deep mitochondrial divergence within species may result from cryptic speciation, from phylogeographic isolation or from endosymbiotic bacteria like Wolbachia that manipulate host reproduction. Phengaris butterflies are social parasites that spend most of their life in close relationship with ants. Previously, cryptic speciation has been hypothesised for two(More)
Damage to the endothelium of blood vessels, which may occur during radiotherapy, is discussed as a potential precursor to the development of cardiovascular disease. We thus chose human umbilical vein endothelial cells as a model system to examine the effect of low- and high-linear energy transfer (LET) radiation. Cells were exposed to 250 kV X-rays or(More)
Little is known about the effects of ionizing radiation on the earliest stages of embryonic development although it is well recognized that ionizing radiation is a natural part of our environment and further exposure may occur due to medical applications. The current study addresses this issue using D3 mouse embryonic stem cells as a model system. Cells(More)
Embryonic stem cells (ESC) are characterized by both the capacity of infinite self-renewal and the ability to give rise to all the three germ layers emphasizing the need to strictly control the genetic integrity. To date, ESC are a powerful tool in disease modeling, tissue engineering and drug testing. However, in the field of radiation research, their(More)
Since essentially no information is available on the effects of high linear energy transfer (LET) radiation on the heart, an assessment of possible late effects on the cardiovascular system is important with respect to the planning of manned long-term space missions [1, 2]. In order to examine if and to what extent heart muscle cells are affected by an(More)
1. Research into language acquisition has focussed on phonological development, aspects of vocabulary growth, and syntactic development. Relatively little attention has been given to the psychological processes underlying a child's ability to formulate approximations to words in his parents' speech-an ability that manifests itself roughly between the tenth(More)
Ionizing radiation is known to delay the cell cycle progression. In particular after particle exposure significant delays have been observed and it has been shown that the extent of delay affects the expression of damage, such as chromosome aberrations. Thus, to predict how cells respond to ionizing radiation and to derive reliable estimates of radiation(More)
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